has no evidence that either side used chemical weapons, others in the obama administration went on offense. >> to say we have no reason to believe the allegations represent anything more than the regime's continued attempt to discredit the legitimate opposition and distract from its own atrocities committed against the syrian people. >> we would warn the regime making these charges, any kind of pretext or cover. for its use of chemical weapons. >> that wasn't the first such warning from the white house. >> red line for us is we start seeing chemical weapons moved around or utilized. >> late today, carl levin, democrat of michigan and chairman of the senate armed services committee told foreignpolicy.com josh rogan he wants to see the u.s. establish no fly zone over syria. others want to see u.s. troops on the ground in syria, possibly in conjunction with nato or other allied forces to secure the stockpiles of chemical weapons. bret? >> bret: james rosen live on the north lawn. thank you. president obama leaves in an hour-and-a-half on his second mideast trip as commander-in-chief. it will